CHAMPION USN72 - Manual (Page 67)

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Part 5: BASIC SERVICE
Drive shaft
Bearing
To gearbox
Seal
Drive
Shaft
Unload end
5.3 Component Repair and Replacement (Cont.)
5.3.17 Take-up Bearing Replacement
Refer to Fig. 6.6, Replacement Parts, for a detailed drawing of the take-up assembly.
It is recommended to replace both take-up bearings at the same time.
To replace the bearings: Turn off all power to the dishwasher. Drain the tanks and remove
the curtains and doors. Loosen the jam nuts (Item 2) and remove all tension from the chains.
Locate the conveyor chain master links (1 per chain) and remove. Pull the chains off the load end
gears and toward the unload end of the machine. Remove the take-up assembly mounting bolts,
(Items 12-14). With the aid of an assistant, lift the entire assembly off the lower mounting studs.
Turn the assembly diagonally in the machine until one end of the shaft extends out the load end of
the dishwasher. Remove the assembly from the machine. Remove the set screw from one of the
chain drive gears and remove the gear. Remove the set screws from the take-up bearings. Pull
the drive shaft out of the bearings. Snap the take-up bearings out of the housings, (Items 5-6).
Replace the bearings and reassemble in reverse order. Adjust the chain tension as described
in Part 5.3.16.
5.3.18 Drive Shaft Bearing and Seal Replacement
Refer to Fig. 6.6, Replacement Parts, for a detailed drawing of the take-up assembly and the
drawing below for a detailed view of the drive shaft seal assembly. It is recommended to replace
both drive shaft bearings at the same time.
To replace the bearings: Refer to Fig 6.6, Replacement Parts. Turn off all power to the dish-
washer. Drain the tanks and remove the curtains and doors. Remove the chain drive cover at the
unload end of the machine. Loosen the jam nuts (Fig. 6.6, Item 2) and remove all tension from
the chains. Locate the conveyor chain master links (1 per chain) and remove.
Pull the chains off the unload end gears and toward the load end of the machine.
Refer to the drawing at right and
Fig 6.5, Part 6, Replacement Parts.
Remove the master link from
the #50 drive chain on the
outside of the machine.
Remove the set screws from
the main drive gear. Remove
the drive gear. Loosen the
set screws from the interior
stainless steel drive gears.
Remove set screws from the drive shaft bearings.
Remove the seal from the bore of the front drive
shaft bearing. With the aid of an assistant, pull the
conveyor drive shaft out the front of the machine.
Remove the four (4) screws holding each of the
drive shaft bearings. Replace the bearings and
reassemble in reverse order. When the drive shaft
is set in the rear bearing, install a new seal. Complete
the reassembly. Adjust the chain tension as described
in Part 5.3.16. Return the dishwasher to service.